var aneObj = function() {
	this.x = [];
	this.y = [];
	this.len = [];
}
aneObj.prototype.num = 50;
aneObj.prototype.init = function() {
	for(var i = 0; i < this.num; i++) {
		this.x[i] = i * 16 + Math.random() * 20;
		this.len[i] = 200 + Math.random() * 50;
	}
	console.log('aa');
}

aneObj.prototype.draw = function() {
	ctx2.save();
	ctx2.globalAlpha = 0.7;
	ctx2.lineWidth = '20';
	ctx2.lineCap = 'round';
	ctx2.strokeStyle = '#3b154e';
	for(var i = 0; i < this.num; i++) {
		ctx2.beginPath();
		ctx2.moveTo(this.x[i], canHeight);
		ctx2.lineTo(this.x[i], canHeight - this.len[i]);

		ctx2.stroke();
	}
	ctx2.restore();
}